Listen carefully to what the Korean boss says in this video.
"Go to the Court", "You have to solve this problem in Court".
This is one of the many delinquent hagwon bosses who is well aware of bias against foreign employees within the Korean judicial system. He has likely been there, bought his way through in Korean and expects to win this way again.
This is someone with powerful friends. The only way the teacher involved can win is with the help of Koreans who have more power than this hagwon boss has... and a reliable translator is a must.